Having used the find files to find a list of files and then selecting those found files to be deleted, Opus massively overestimates the total file size for all files. I have selected a 170 files of no more than a few hundred bytes each and opus reports that I am going to delete 978 Terabytes. I wish my hard drive was really that big!
Seems like there should be seomthing unique about this - it doesn't seem to be a general issue... So, is "I:" drive a network drive mapping of some kind? If so, to what kind of a network share (windows v??, samba, nas device, etc)?